[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: S.s. info...re: differing secondaries
Original poster: "Kennan C Herrick by way of Terry Fritz <twftesla-at-uswest-dot-net>" <kcha1-at-juno-dot-com>
comments from KCH interspersed...
On Sat, 17 Feb 2001 15:22:04 -0700 "Tesla list"
> Original poster: "R.E.Burnett by way of Terry Fritz
> Hi Ken,
> Thanks for putting our minds at rest ;-)
> I was going to post you a question asking how you ensure that your
> locks on to the "Fundamental" of your resonator and not one of the
> "Harmonics" of the resonator.
> I guess your phase adjustment circuit performs a similar function to
> tuned grid used by the tube guys ??? Does this ensure that the
> oscillator does not accidentally start at 3xF instead of the
> frequency ???
My phase adjustment has merely been a 0.15 uF capacitor to ground through which
the secondary current flows (with back-to-back diodes across it to limit the
voltage). Following that, a few stages of linearly-configured CMOS logic ICs
for amplification, leading to the gated MOSFET-driving circuits.
But I have found, just today, that I seem not to have enough amplification when
using my 36" coil. So I have to re-work that part of the circuit; and at the
same time, try to figure out a better, variable, phase-adjusting scheme to
accomodate various secondaries.
> Sorry for all the questions, but I'm thinking of converting my SSTC
> that it uses the primary current as the reference to switch the
Do you not mean secondary current? You'd want the secondary's Fr to be the
determinant of operating frequency.
> > Original poster: "Kennan C Herrick by way of Terry Fritz
> > To John Freau, R. E. Burnett et al:
> > Big dummy that I am, I neglected to realize that I had to adjust
> > phase angle of the signal I pick off the secondary for excitation
> of the
> > primary circuit. Just now, temporarily substituting a sig. gen.
> > for that signal, I find that my 36" space-wound coil does indeed
> seem to
> > function at least as well as the 52" one. I'll still construct
> > close-wound 36" coil (more like 32" if I can only get a 10# wire
> > so as to compare that to the others.
> > Next task is to incorporate a selectable-phase-shift circuit so as
> > accomodate various secondaries conveniently. It just goes on &
> > More later...
> > KCH
> > ________________________________________________________________
> > GET INTERNET ACCESS FROM JUNO!
> > Juno offers FREE or PREMIUM Internet access for less!
> > Join Juno today! For your FREE software, visit:
> > <http://dl.www.juno-dot-com/get/tagj>http://dl.www.juno-dot-com/get/tagj.